MQL4 of Quantitative Trading-File and Folder Related Operation Functions

string foo[4];

void OnStart() {
   

   

    // Folder and related operation functions

   // Create/delete abc folder
   FolderCreate("abc", 0);
   FolderDelete("abc", 0);
   // Clear all files in the abc folder
   FolderClean("abc", 0);
   

   

    

    

    

   
    // File and related operation functions
   
   // Move/copy the a.txt file under folder a to folder b and rename it to abc.txt
   if(FileMove("a//a.txt", 0, " b//abc.txt", 0) == false){
      Alert(GetLastError());
   }
   if(FileCopy("a//a.txt", 0, "b//abc.txt", 0) = = false){
      Alert(GetLastError());
   }
   // Delete the file
   FileDelete("text.csv");
   
   if(FileIsExist() == true) {
      Print("File exists");
   } else {
      Print("File Does not exist");
   }
   
   string fileName;
   // "*" indicates the condition of searching for files, eg: if you want to search for files containing t, use "t*" to indicate
   long fff = FileFindFirst("*", fileName, 0);
   if(fff! = INVALID_HANDLE) {
      // If there is another file in the current directory
      while(FileFindNext(fff, fileName) == true) {
         //
         //
      }
   }
   
   
   
   
   
   
   
   
   
   // File content operation function
   
   // FILE_CSV: open csv file, FILE_SHARE_READ: multiple paths can access at the same time
   int h = FileOpen("text.csv ", FILE_READ|FILE_WRITE|FILE_CSV|FILE_SHARE_READ,',', CP_ACP);
   
   if(h != INVALID_HANDLE) {
      // Write the file to the cache
      FileWrite(h, Symbol(), High[0], Open[0 ], Low[0], Close[0]);
      FileWrite(h, Symbol(), High[1], Open[1], Low[1], Close[1]); // Write to csv file The second line
      
      // The array written must be a string array;
      foo[0] = High[0];
      foo[1] = Open[0];
      foo[2] = Low[0];
      foo[3] = Close[0];
      FileWriteArray(h, foo, 0, WHOLE_ARRAY);
      
      
      // Write the contents of the current cache to the file
      FileFlush(h);
      
      // You cannot use
      string read immediately after the FileWrite function ;
      ulong ft = 0;
      while(FileIsEnding( h) == false) {
         
         if(FileIsLineEnding(h) == true) {
            Print(read);
            read = "";
         }
         
         // Force the cursor to move to position 16 in the file
         FileSeek(h, 16, SEEK_SET);
         / / Read the position of the cursor in the file
         ft = FileTell(h);
         read += FileReadString(h, 0);
         ft = FileTell(h);
      }
      
      // When FileClose is called, the contents of the current cache will be written at once File
      FileClose(h);
   }
   
}